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  4. In which of the following complex the nickel metal is in highest oxidation state?

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Q. In which of the following complex the nickel metal is in highest oxidation state?

The d-and f-Block Elements

Solution:

$\left[ Ni ( CO )_{4}\right]$ carbonyl is a neutral ligand.
So the oxidation state of nickel is $O$.
$K _{2}\left[ NiF _{6}\right]$ fluoro is anionic ligand with $-1$ charge.
So the oxidation state of nickel is $+4$.
$\left[ Ni \left( NH _{3}\right)_{6}\right]\left( BF _{4}\right)_{2}$ ammine is neutral ligand and $BF _{4}$ has $-1$ charge.
So the oxidation state of nickel is $+2$.
$K _{4}\left[ Ni ( CN )_{6}\right]$ cyano is anionic ligand with charge $-1$.
So the oxidation state of nickel is $+2$.